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One of its features is grouping. Many people understand grouping like it is defined in Sql. Linq is implementing grouping quite the same way. Let's discover this syntax and how to make consecutive groups easier.

101 LINQ Example with sample code snippets....This sample prints each element of an input integer array whose value is less than 5. The sample uses a query expression to create a new sequence of integers and then iterates over each element in the sequence, printing its value

When using Linq to objects, you will quickly feel the need to pass some parameters from a method to another but it's not so easy because each Linq method is not calling the following one. In a Linq sequence, each method is using the result computed by the previous one. So, local contexts are not visible from one method to another. The compiler is using two technical different ways to let parameters go out of a method.

A lambda expression is an anonymous function that can contain expressions and statements, and can be used to create delegates or expression tree types.

All lambda expressions use the lambda operator =>, which is read as "goes to". The left side of the lambda operator specifies the input parameters (if any) and the right side holds the expression or statement block. The lambda expression x => x * x is read "x goes to x times x." This expression can be assigned to a delegate type as follows:

Throughout this article, we will build a simple IQueryable provider similar to the LINQ to SQL provider demonstrating what is needed to build a custom provider that is capable of executing LINQ queries and performing create, update and delete operations.

As developers we have a wide array of tools at our disposal. One of the most time consuming, but most beneficial tasks we must undertake is to determine which of those tools to use for a given situation.

I usually work with windows forms, and am just starting to work with ASP.Net, so appologies if this is a dumb question!

I have a master page which has a search button on it. The results of this are built up using a Linq statement and if there are any results, I want to display the results in a contents page.

On the masterpage, I have the following code:

Private _res
Public Overridable ReadOnly Property SearchRes()
Get
Return _res
End Get
End Property
Private Sub DoSearch()
'some code to get a linq result
'then
If res.Any Then
_res = res
Server.Transfer("SearchResults.aspx", True)
Else
'no results
LabelNoRes.Visible = True
End If
End Sub

I'm not sure how to structure the code for this but what I want to do is be able to add data to a database, and once this has completed successfully, then email the user to say the details have been added successfully to the database.

SELECT COUNT(tb_Mailer_Smses.Id) AS [cnt], tb_Mailer_mailing.Id As [Id]
,SUM( CASE WHEN tb_Mailer_smses.DLRStatus = 200 THEN 1 ELSE 0 END) As [Delivered]
,SUM(CASE WHEN DLRStatus BETWEEN 300 AND 499 THEN 1 WHEN DLRStatus BETWEEN 800 AND 899 THEN 1 END) AS [Errors]
FROM tb_Mailer_mailing INNER JOIN
tb_Mailer_Smses ON tb_Mailer_mailing.Id = tb_Mailer_Smses.MailingId
WHERE tb_Mailer_mailing.ApplicationId = 1
GROUP BY tb_Mailer_mailing.Id

There is an entity (Table) called "Filters" in my .edmx which has all my tables and stuff in it (to use it for LINQ queries)

I have created a class called "CustomFilters" which inherits "Filters". So now my cutom class has all the properties of the original "Filters" class (table) and 1 more additional property that i wanted which is a List of "CustomFilters":

List<CustomFilters> children = new List<CustomFilters>();

Now i get all my records into:

List<CustomFilters> theOriginalList = new List<CustomFilters>();

NOTE: first all records are tken into a List<Filters> and then these are added into List<CustomFilters> where List<CustomFilters> for children of that record is added, and then children of the child records, and so on......

so now, every record is an instance of CustomFilters which has a property named "children" which is a list again; and each child again has instanaces of "CustomFilters", and each instance again has children...and on and on and on.....

(basiacally its a data source for a treeview in my silverlight control)

I have the a question am going about his correctly I have a database for categories, it has many fields and about 4000 records, but with a Jquery autocomplete needing speed and the fact that I only need to return a key and category name. I did the following: (oh just to note, MVC2, Ajax project)

I want to display some stats in a listview contril. The table contains a record for every impression and for every click, and every record has a datetime field for the time and date of the impression of click. I want to be able to display how many impressions and clicks there were in a given day and hour, something like below: